Laser cutting is usually carried out on horizontal planes or on slightly angled plates. However, there has been no report on cutting on large-angle inclines. Fig. 1 is a schematic diagram of a cavity with a slotted hole in a steam turbine. The thickness of the material is 6mm. There are about 60 holes on the entire round table, and the circle table is larger than Æ 3000mm. It is required that the pitch error of each hole after processing should not exceed ± 0.05mm, and the pitch cumulative total error should not exceed 0.5mm; the tilt angle a=31°, b=0.5°, and q=41.37°. The error of these three angles is not less than ± 0.005°, requiring a smooth cavity surface. In the past, wire cutting was used for processing. The production efficiency was low and the workload was large and the production cycle could not be guaranteed. Therefore, the use of laser cutting to replace the conventional wire cutting process was studied to meet the needs of batch production. (1) In order to achieve a bevel cut with a total inclination of 31.5°, the high-precision cutting tooling of Fig. 2 needs to be manufactured. The dimensional tolerance of the pitch pitch of the tooling is controlled within ±0.01mm, and the shroud is processed after the subsection machining to solve the problem. The entire perimeter of the perimeter is more than Æ 3000mm. Unworkable puzzles. (2) Adjust the coupling of laser processing parameters. When laser power P = 1260W, cutting speed v = 1.4m/min, ordinary oxygen (purity 99.8%) as auxiliary gas, gas pressure is 0.08MPa, large angle bevel laser can be realized. Cutting, slit width of about 0.18mm. (3) The change of the laser head nozzle distance from the workpiece and the amount of coke entering have an important influence on the quality of the incision. Too far away from the workpiece will make the incision widen and the roughness increased, and the distance between the nozzle and the nozzle may easily collide with the workpiece. The distance is controlled between 0.5 and 0.8 mm from the workpiece. The quality of the cavity after cutting is better. The amount of coke input (ie, the position of the laser focal point within the workpiece) is about 1 mm, which ensures that the incision is smooth, no chamfering occurs at the entrance of the incision, and a good surface processing quality is obtained. (4) As it is a three-dimensional space closed surface processing, in the production of the machining program, we must consider the accuracy of the modeling of the surface, but also consider the program linear interpolation step length, the experiment shows that the linear interpolation step length to take 0.02mm, the effect is it is good. The mass production of more than 10,000 holes indicates that it is feasible to use a laser to perform cutting on a large-angle bevel, as long as the coupling of the laser parameters is reasonable, and the distance from the nozzle to the workpiece, the amount of coke input, and the linear interpolation of the program are well controlled. Long, it can realize the precision machining of 31.5° bevel and board thickness of 6mm, and the roughness of the hole after machining reaches Ra 3.2mm. The single hole was cut from the original line for 90 minutes, reduced to 34 seconds of laser processing, and the processing efficiency was improved by more than 100 times. Paper Cup Machine,Paper Cup Making Machine,Automatic Paper Cup Machine,Paper Cup And Plate Making Machine RUIAN RUIZE MACHINERY CO., LTD , https://www.ruizemachinery.com
Figure 2 Tooling Schematic